Hallo, ich habe folgendes Problem:
Ich möchte momentan nur eine kleine Tabelle in MySQL 5.0.51a mit Hibernate ansprechen. Die Tabelle Halle hat zwei Attribute, Name (VARCHAR) und id(INTEGER).
Ich habe mir aus der Uni Bibliothek das Hibernate Praxisbuch von Sebastian Hennebrüder ausgeliehen und versuche daher, das Annotation Mapping zu erstellen, das klappt aber nicht, ich kriege eine MappingException.
Ich habe auch schon auf der hibernate.org Seite unter "Documentation - getting started - I want to learn Hibernate Annotations!" das dort angesprochene PDF angeschaut, auf Seite 33 ist ein Codebeispiel, die Annotations daraus liefern bei mir aber auch denselben Fehler.
Momentan bin ich ziemlich ratlos, da ich ja grade erst mit Hibernate anfange und daher keine Erfahrung damit habe.
Meine Klassen:
Halle.java
Code:
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class Halle implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
private String name;
@Id
@GeneratedValue
@Column(name = "idHalle")
private Integer id;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Halle() { }
public String toString() {
return "Halle / Gebäude: " + name + ", ID: " + id;
}
}
InitSessionFactory.java (aus dem Buch übernommen)
Code:
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* @author hennebrueder This class garanties that only one single SessionFactory
* is instanciated and that the configuration is done thread safe as
* singleton. Actually it only wraps the Hibernate SessionFactory. When
* a JNDI name is configured the session is bound to to JNDI, else it is
* only saved locally. You are free to use any kind of JTA or Thread
* transactionFactories.
*/
public class InitSessionFactory {
/** The single instance of hibernate SessionFactory */
private static org.hibernate.SessionFactory sessionFactory;
/**
* Default constructor. It is private to guaranty singleton
*/
private InitSessionFactory() {
}
static {
final Configuration cfg = new Configuration();
// final AnnotationConfiguration cfg = new AnnotationConfiguration();
/*
* change the cfg to a annotation configuration, if you want to use
* Hibernate annotations as well. Annotation configuration supports both
* XML and annotations
*/
/*
* configure Hibernate from hibernate.cfg.xml. This is expected to be in
* the class path = "src folder" = "root folder of classes"
*/
cfg.configure("/hibernate.cfg.xml");
cfg.buildSessionFactory();
sessionFactory = cfg.buildSessionFactory();
}
/**
* Returns the single instance of the session factory
*
* @return
*/
public static SessionFactory getInstance() {
return sessionFactory;
}
}
Test.java
Code:
import java.util.Iterator;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class Test {
public static void main(String args[]) {
try {
createHalle();
showHallen();
deleteHalle();
} catch (RuntimeException e) {
try {
Session session = InitSessionFactory.getInstance().getCurrentSession();
if (session.getTransaction().isActive()) {
session.getTransaction().rollback();
}
} catch (HibernateException ex) {
System.out.println("Error rolling back Transaction");
}
throw e;
}
}
private static void createHalle() {
Halle halle = new Halle();
halle.setName("Halle 57");
Session session = InitSessionFactory.getInstance().getCurrentSession();
Transaction tx = session.beginTransaction();
session.save(halle);
tx.commit();
}
private static void deleteHalle() {
Halle halle = new Halle();
halle.setName("Halle 57");
Session session = InitSessionFactory.getInstance().getCurrentSession();
Transaction tx = session.beginTransaction();
tx.commit();
}
private static void showHallen() {
Session session = InitSessionFactory.getInstance().getCurrentSession();
Transaction tx = session.beginTransaction();
List hallen = session.createQuery("select h from Halle as h").list();
for ( Iterator iter = hallen.iterator(); iter.hasNext();) {
Halle halle = (Halle) iter.next();
System.out.println(halle);
}
tx.commit();
}
}
hibernate.cfg.xml
Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-/hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection-url">
jdbc:mysql://localhost/xxx
</property>
<property name="connection.username">xxx</property>
<property name="connection.password">xxx</property>
<property name="connection.driver_class">
com.mysql.jdbc.driver
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="cache.provider_class">
org.hibernate.cache.EHCacheProvider
</property>
<property name="current_session_context_class">thread</property>
<property name="hibernate.transaction.factory_class">
org.hibernate.transaction.JDBCTransactionFactory
</property>
<property name="hibernate.hbm2dll.auto">auto</property>
<mapping class="Halle" />
</session-factory>
</hibernate-configuration>
Exception:
Code:
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.lang.ExceptionInInitializerError
at Test.createHalle(Test.java:31)
at Test.main(Test.java:12)
Caused by: org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping class="Halle"/>
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1606)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1561)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1540)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1514)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1434)
at InitSessionFactory.<clinit>(InitSessionFactory.java:39)
... 2 more
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